LBL-91 Revised UC-414 September 1996 CURRENT EXPERIMENTS IN PARTICLE PHYSICS Particle Data Group H. Galic Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94305 USA F. Lehar Centre d'Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette, France V.I. Klyukhin, Yu.G. Ryabov Institute for High Energy Physics, RU-142284 Protvino, Moscow Region, Russia S.V. Bilak, N.S. Illarionova Institute of Theoretical and Experimental Physics, RU-117259 Moscow, Russia B.A. Khachaturov, E.A. Strokovsky Joint Institute for Nuclear Research, RU-141980 Dubna, Moscow Region, Russia C. M. Hoffman Los Alamos National Laboratory, Los Alamos, NM 87545, USA P.-R. Kettle Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland A. Olin TRIUMF, 4004 Wesbrook Mall, Vancouver BC V6T 2A3, Canada F.E. Armstrong (Technical Associate) Particle Data Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA Abstract - This report contains summaries of current and recent experiments in Particle Physics. Included are exper- iments at BEPC (Beijing), BNL, CEBAF, CERN, CESR, DESY, FNAL, Frascati, ITEP (Moscow), JINR (Dubna), KEK, LAMPF, Novosibirsk, PNPI (St. Petersburg), PSI, Saclay, Serpukhov, SLAC, and TRIUMF, and also several proton decay and solar neutrino experiments. Excluded are experiments that finished taking data before 1991. In- structions are given for the World Wide Web (WWW) searching of the computer database (maintained under the SLAC-SPIRES system) that contains the summaries. The publication of this report is supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, the Division of High Energy Physics of the U.S. Department of Energy under Contract No. DE- AC03-76SF00098, and by the U.S. National Science Foundation under Agreement No. PHY-9320551. Partial funding to cover the cost of the publication is also provided by an implementing arrangement between the governments of Japan (Monbusho) and the United States (DOE) on cooperative research and development. H. Galic is supported by the U.S. Department of Energy under Contract No. DE-AC03-76SF00515. iDISTRIBUTION OF THIS DOCUMENT IS UNLIMITED^ DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or use- fulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any spe- cific commercial product, process, or service by trade name, trademark, manufac- turer, or otherwise does not necessarily constitute or imply its endorsement, recom- mendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced firom the best available original document* TABLE OF CONTENTS Introduction 1 Searching the EXPERIMENTS computer database 3 Spokesperson index 7 Abbreviations used in the summaries Journals 12 Kinematic variables 13 Accelerators 13 Detectors 14 Summaries of experiments BEPC (Beijing) 17 BNL 17 CEBAF 25 CERN 32 CESR 50 DESY 52 FNAL 56 Frascati 68 ITEP (Moscow) 69 JINR (Dubna) 71 KEK 73 LAMPF 77 Novosibirsk 80 PNPI (St. Petersburg) 81 PSI 82 Saclay 85 Serpukhov 89 SLAC 95 TRIUMF 98 Underground/Underice/Underwater 101 IV INTRODUCTION This report contains full summaries of 180 approved current and recent experiments in elemen- tary particle physics. The focus of the report is on selected experiments which directly contribute to our better understanding of elementary particles and their properties such as masses, widths or lifetimes, and branching fractions. This year's report is, in a way, a companion volume to the main Particle Data Group publication, Review of Particle Physics. Experiments at the following laboratories are included: BEPC (Beijing) * LAMPF (Los Alamos) * BNL (Brookhaven) * Novosibirsk (Inst. Nucl. Phys.) CEBAF (now Jefferson Lab) PNPI (St. Petersburg) CERN (Geneva) * PSI (Villigen) * CESR (Cornell U.) * SATURNE (Saclay) * DESY (Hamburg) * Serpukhov (Inst. High Energy Phys.) FNAL (Batavia) * SLAC (Stanford U.) * Frascati (Lab. Nazionali) TRIUMF (Vancouver) ITEP (Moscow) * Underground experiments JINR (Dubna) * Underice experiments KEK (Tsukuba) * Underwater experiments For the institutions marked with an asterisk, the corresponding summaries section also contains a brief description of the particle physics plans at the laboratory till the end of the century. We also list 263 other experiments at the above laboratories. Although, to the best of our know- ledge, these experiments do not measure directly the properties of particles listed in the Review of Particle Physics, they still may be of considerable interest to the particle physics community. These additional experiments only have brief entries in the printed version of the report, but often have a full description in an online-accessible database from which the report is produced. The readers are encouraged to find more information about those experiments in the database (see below). We exclude from this year's report the experiments for which the data collection was completed before 1991. We generally do not cover the experiments dealing primarily with nuclear levels or other nuclear-structure properties. As to the choice of institutions, we try to include those in which particle physics experiments top the list of priorities at the laboratory. Sources of information — Our first information about an experiment usually comes from the proposal for the experiment. Subsequently, we follow the progress of the experiment as best we can in laboratory reports such as Experiments at CERN. Finally, a few months before an edition of this report is to appear, we send copies of the summaries of the experiments to the spokespersons for checking and updating. If a reply is received — as was the case for 90% of the experiments — there is a "^ " next to the spokesperson's name. Since current experiments are often in flux, we rely heavily on these replies to be up to date: no ^ by the spokesperson means the summary may be inaccurate or incomplete. (For a handful of experiments, we verified our information with a senior member of the experiment, not the spokesperson, but for simplicity put a -J by the spokesperson. For experiments with more than one spokesperson, all the spokespersons are checked even if only one of them replied.) Computer database — This report is produced from a computer database maintained at SLAC under the SPIRES database management system. The database, named EXPERIMENTS, also contains information from earlier editions of this report, going back to about 1975, and includ- ing older experiments at Argonne, INS, IUCF, and Rutherford. See page 3 for a guide to using the EXPERIMENTS database via the World Wide Web (WWW). Summaries — Each summary lists several dates related to the experiment: the date of the proposal, the approval date, and when the data-taking began and was completed. The title of the proposal and the most recent list of participants are given. The detector used in the experiment is identified either by a generic name (e.g., counter) or by a widely known acronym (e.g., SLD). The most important reactions and particles studied and the beam energy or momentum are listed where known. A brief comment describing the apparatus and the main goals of the experiment may follow. A summary ends with a list of any journal articles on results or instrumentation of the experiment. Related experiments, similar either in methods used or in subject of study, are also listed. Where known, an e-mail contact address and the WWW uniform resource locator (URL) are given. Abbreviations — To keep the summaries brief, abbreviations are used to indicate journals, kinematic variables, accelerators, and detectors. The abbreviations are usually obvious but are also denned near the beginning of the report. The abbreviated forms are needed for searching the EXPERIMENTS database online. Acknowledgments — P. Yamin (BNL), D. Buckle (CEBAF), M. Draper and B. Powell (CERN), and J. Parker (FNAL) kindly provided computer files with data on experiments from their respective institutions. Valuable additional information was obtained from P. Yamin (BNL), G. Fraser (CERN), P. Drell (CESR), P. Folkerts (DESY), R. Rubinstein (FNAL), M.V. Danilov (ITEP), H.K. Walter (PSI), and D.W. Leith (SLAC). We thank F.E. Armstrong (LBL) for her help with the final processing of the manuscript. We particularly thank the hundreds of spokespersons who took the time to reply to our inquiries. Comments and requests — We invite comments pointing out omissions, obscurities, out- of-date information, and errors. We also encourage spokespersons to send us proposals and letters of intent for their future experiments. Comments and other material should be sent to: EXPERIMENTS (c/o H. Galic) SLAC Library, MS 82 P.O. Box 4349 Stanford, CA 94309, USA e-mail: [email protected] To order additional copies of the Current Experiments from North and South America, Australia, and the Far East write to: CURRENT EXPERIMENTS Particle Data Group, MS 50-308 Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA e-mail: pdg@lbl. gov Requests from all other areas should go to: CERN Scientific Information Service CH-1211 Geneva 23 Switzerland http://wwwas.cern.ch/library/ (select - Ordering CERN Publications) SEARCHING THE 'EXPERIMENTS' DATABASE VIA WORLD WIDE WEB The summaries of current and many earlier experiments related to particle physics are contained in a computer database called EXPERIMENTS, maintained at SLAC under the SPIRES database management system. Note that even .the experiments which only have a brief description in this report may still have a full description in the database. You can access the EXPERIMENTS database most easily via the World Wide Web (WWW).